Have you tested with the default drivers from Windows?
You could also test your system with the drivers provided by your OEM.
I look forward to your outcome with this.
the default windows drivers don't recognize the external display at all. And yes I have tried the OEM driver, same problem.
I forgot to mention that the OS is Windows 10. Also there is a chance that we might never find out how this bug came to exist because out of frustration I have used the built in reset function of Windows 10 to reset my whole system. Even after I did this, the display still claimed to be 1080p.
I have then completely formatted my device and lo and behold now I can use the UHD screen again.
Because the Windows reset didn't fix the problem either I assume it has to do something with a faulty registry key, because that's how the issue persisted even when removing drivers/resetting the system.
I am sorry to hear that owah; Have you tested the latest drivers for Windows 10*?
They were recently released: Download Intel® Graphics Driver for Windows® 10 [15.40][4th Gen]
I look forward to hearing from you.
I have tried installing the driver via the .exe. The installer aborts and claims that this driver isnt compatible with my system. So I have downloaded the packed .zip and extracted the driver to manually install it. This didn't work either because my system claimed that the installed driver is already new enough.
So what i have done is remove the current driver and then installed your supplied driver from scratch. My system now accepted the driver but the TV still only outputs 1080p. Something else I have noticed is: I am not able to play audio through HDMI anymore, this must be related to the laptop recognizing the TV only as a 1080p screen without speakers.
I'd like to mention again, that just 40 minutes ago I have used my Arch-Linux install to play UHD content. So it can't be the cable/TV/intel HD card.
But the problem should rather be located within either the OS or the intel windows driver.
Thank you for you answer on this.
Please make sure you have all window updates installed in your system, you can also use the system file checker from windows to troubleshoot this, link added below:
Due to the fact you are using the generic drivers from Intel on an OEM system we cannot make sure they are going to work properly, for that reason, I would like to recommend you to contact the manufacturer of your device to find any additional drivers to be used or remaining troubleshooting to be performed.
As you said the cables and hardware are working fine with the tests performed on the other OS so the remaining options as the failure will be OS or drivers.
Any further feedback on this after getting in touch with the OEM would be great to have for future references.
If any additional questions or inquiries are present, feel free to contact us back.